> Military subs have a lot high-tech stealth tech (much of it classified) to hide their electronic signals, engine noise, and so on. Subs have no electronic si

> Military subs have a lot high-tech stealth tech (much of it classified) to hide their electronic signals, engine noise, and so on. Subs have no electronic signals. Water is mostly opaque to EM waves. Small subs are by design pretty silent. It is going pretty hard to pick them up above the noise of the sea. > doesn't that mean actual (enemy) Chinese / Iranian / Russian subs can get away with a lot Actual enemy subs can get away with a lot. You can safely assume that both China, Russia, France and the UK are able to launch a most likely successful nuclear strike on the USA as you are reading this. That's the heart of nuclear deterrence. > anti-sub network alerts I have bad news for you. It's extremely hard to find a sub. Water doesn't carry sound in straight lines due to heat and salinity gradients. The ocean is full of pockets of silence. Modern countries have boats with towed sonars and submarines looking for enemy submarines but as far as I know in this game of cats and mouses the ones who want to stay hidden are usually winning.